The Second Death of Sakurai's Object (V4334 Sgr)

Details The Second Death of Sakurai's Object (V4334 Sgr) The Second Death of Sakurai's Object (V4334 Sgr)

Nov 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..804..183z&link_type=abstract

PLANETARY NEBULAE AS ASTRONOMICAL TOOLS: International Conference on Planetary Nebulae as Astronomical Tools. AIP Conference Pr

Astronomy and Astrophysics

Astronomy

3

Circumstellar Matter, Planetary Nebulae, Circumstellar Shells, Clouds, And Expanding Envelopes, Circumstellar Masers, Planetary Nebulae

Scientific paper

The discovery of Sakurai's Object, in 1996, provided the first modern observations of a very late thermal pulse. Models predicted that it would become a born-again planetary nebula over a few hundred years. It is however evolving very much faster: the first radio detection shows that ionization of the envelope has already started. To reproduce its unexpectedly fast evolution, we have developed a model in which convective mixing is strongly suppressed under the influence of flash burning. A strong prediction of this model is that the star will evolve back to very high temperatures at equally accelerated time scales. A CLOUDY photoionization model of the hydrogen-poor nebula indicates an ionized ejecta (carbon) mass of ~ 10-3 Msolar, indicating that born-again objects may be significant contributors to carbonaceous dust in the galaxy.

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